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| Paper: |
Morphology vs. Physical Properties: Some Comments and Questions |
| Volume: |
199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures |
| Page: |
25 |
| Authors: |
Corradi, Romano L. M. |
| Abstract: |
Some of the correlations between morphological and other physical properties of planetary nebulae (PNe) are reviewed. In particular, the finding that bipolar b PNe have more massive progenitors than the other morphological classes is discussed in detail. Earlier results are confirmed; including all the various sources of uncertainty, the Galactic distribution of objects indicate that bipolar planetary nebulae are formed by stars with initial masses > 1.3 M⊙ while elliptical e PNe by progenitors with masses < 1.3 M⊙. Recent results for the chemical abundances of b and e PNe and their orientation within the Galaxy are also presented. Finally, the key role in the discussion of the formation of b PNe played by detached binary systems such as symbiotic stars is briefly discussed. |
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